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不同土壤管理方式对河西地区杏园土壤性质及果实品质的影响

Effects of Different Soil Management Methds on Soil Properties and Fruit Quality in Apricot Orchards in Hexi Region

  • 摘要: 以河西地区杏园为研究对象,以清耕为对照,设置生草和覆草2个处理并开展田间试验,采用相关性分析和隶属度函数法综合评价,不同处理对杏园土壤理化性质及杏果实产量与品质的影响。结果表明:与清耕对照相比,覆草与生草处理在5—10月均表现出显著的土壤降温效应,10月份后则转为保温效应,其中覆草处理的保温效果优于生草处理;覆草与生草处理均能显著提高土壤含水量,降低土壤pH值和容重,提升土壤有机质、有效磷及速效钾含量,且覆草处理的养分提升幅度高于生草处理。在果实品质方面,覆草与生草处理显著提高了杏果实的单果重、产量、可溶性固形物和总糖含量,并降低了可滴定酸含量。相关性分析表明,果实产量与土壤pH值呈负相关,可溶性固形物含量与有效磷含量呈正相关。基于隶属函数法的综合评价结果显示,综合效益排序为:覆草>生草>清耕。综上,覆草与生草处理均可有效改善杏园土壤水热状况、优化土壤结构、提升土壤肥力,并提高杏果产量与品质。覆草处理短期内对土壤改良及果实品质提升的综合效益最为显著,为河西地区杏园优先推荐的土壤管理措施;生草处理因更贴近自然生态而具有更优的长期可持续性。

     

    Abstract: Clean tillage was used as the control, and straw mulching, and cover cropping treatments were established in the apricot orchard in Hexi region. The subordinate function method was employed for a comprehensive evaluation of the effects of different soil management practices on soil physicochemical properties, apricot fruit yield and quality. The results showed that compared with clean tillage, both straw mulching and cover cropping treatments showed significant soil cooling effects from May to October, but a heat preservation effect after October, with straw mulching demonstrating superior heat preservation. Both treatments significantly increased soil water content, decreased soil pH value and bulk density, and enhanced the contents of soil organic matter, available phosphorus, and available potassium. The improvement in nutrient content was generally greater in the straw mulching treatment than in cover cropping. Regarding fruit parameters, both straw mulching and cover cropping significantly increased the single fruit weight, yield, soluble solids, and total sugar content of apricot fruits, while reducing titratable acid content. Correlation analysis indicated that fruit yield was negatively correlated with soil pH value, and soluble solids were positively correlated with available phosphorus. Based on the subordinate function, the comprehensive evaluation showed that the benefit ranking of the treatments was straw mulching > cover cropping > clean tillage. In conclusion, both straw mulching and cover cropping treatments effectively improved the soil hydrothermal regime, optimized soil structure, enhanced soil fertility, and ultimately increased apricot yield and quality. Among them, the straw mulching treatment demonstrated the most significant comprehensive benefits for soil improvement and fruit quality enhancement in the short term, making it the preferentially recommended soil management practice for apricot orchards in this region. However, the cover cropping model, being closer to the natural ecosystem, may possess better long-term sustainability.